Permanent wave for long hair (noun): hair treatment that creates curls or waves by mechanically altering hair structure through chemical reduction followed by a chemical oxidation. It's popular for adding body and texture to long, straight hair.
Perms for long hair have been around since the early 1900s, when they were first introduced by German hairdresser Karl Nessler. In the past, perms were known to damage hair, but modern techniques and formulations have made them much gentler. Perms offer long-lasting curls or waves that can enhance natural texture and create a wide range of styles.